Adjustable die-stock.



11N'113311113"13213.47 Es PAENT OFFICE.

itiuronn BGRDEN', ou WARREN, OHIO, -AssIoNonjro TH'E BORDN COMPANY, or` WARREN, c1110, A CORPORATION F eine. f

- ail whom it may concern: 4

Be'ii. known that 1,-Bmmro1m Bonnes', of Warren, in the county of Tr'uxnbuli and State of Ohio, have invented certain new and useful Improvements' in Adjustable Die-Stocksfand I do hereby declare the following to be a ull, clear, -and exact description of the invention, such as wllenable others skilledin the art' I to which it appertains to make and use the sam'e.

The objects of-thisinvention are, dfirst, to `insure the.

holdingof the chasers totheir work and at the same time allow of their grdualoutward movementin the cutting oa taper thread, either' right or left hand; and, secondly, tomaintain the integrity of the device by avoiding any impairment'of the strength of .the er holder.

Referring to the .lrawingsgl 1- designates the chaser holder 2, which lattei is shown in the form of a solid ring fitted in said ichafmber, bearing-against the back oi the housing andca'pable of being rotated iu either direction. This .ring a series of verse slots forming guideways for a series of chasersl 3,

whichlatter are threaded at their inner ends, and near their outer ends are .equipped with laterally extended 3C studs 4.

. 5 designates a envergure ty whigh the .ring it-heu within the housing, .such plate being rigidly secured. thereto by screws 6, and 'at its center it has a circular opening corresponding to the openingsin the ring and the 1mi wall of the housing. 4In this'eover plate are formed. cam slots' 7-intoiwhichthe'st'uds 4 project, said com slots being arranged in pairs so that thdevice ne used for cutting both right and feit hand threads, the

inner end of each slot opening into 4the corresponding .0 end of the complementarv slot, said inner ends boing nearer the axial center .1" the `h'ousing than the outer.

ends thereof. AAsi'tlre cutting begins the studs'4' are ordinarily located'at 'the nnerends of their respective can; slots, and as the work progresses the studs are 4:3 caused to travel toward the outer ends thereof and there-bjr gradually-dimi'. the chasers outward so as to E'prmtlucea taper thread.

8 designates a wedge with which. a pin 9 of the'chaser 'holder is caused to engage, suf-h pin projml ing through a 51 slot 10 formed in thcfircular wail o( ihi housing. This i irdge is shown in the :wrm of a triangular block having at its rear a threaded extension which is mounted in a A'ring 12 axially movable on the ordinary work holder 1Q mm-s Hw nin "To threaded is secured. -Thf 'si l A Anitrs'rannn DmgsTOCK.

Specification Patent.,v4 Anneau nea pra is, mos. serai 110.255,341':

the housing having a concentric ihzimberw accommodate Patented Sept. 3,1907.

wedge is held by a spline l3to housingl to retain in proper position relative to s'uch housing and still allow I the latter to nieve at right angles to the wedge;A "The screw is removable so that screws and work holdersor left .and right hand threads may be interchangeably adjustable screw. 1 5" passed transversely therethrough iso'A as .to eotac't'kwith the tapered side of the wedge,

Stherleb-y. enabling the chasers to be adjusted t conform .to 'the size vofpipeto be threaded", When cutting aurightjhand thread, pin 9 is located, as shown in full linesjFigal-and 2, while in cutting left hand threads 'thechaserholder is turriedaxially so as to position the pin on theother side oi the wedge. As the work pro- 'gressstlie die stocl travels inwardly toward the work holder, and the pin 9 of thechase'r holder being in 'onggerhent with-the wedge4 'is gradual forced longitu- "dinally of slot 10,'therebyturning the chaser holder in the housing and drawing the chasers outward by rcason of the studs thereof moving toward the outer ends 'of the cam` slots. In practice, as theicutting operation begins, with a pipe held inthe work lolderas soon as pressure is applied te the housing to turn it in the desired direction, the chasers win-move in me opposite direction, until The limit of, moveinent of the chasers is coextensive with the inner ends oi the cam slots, and as the cutting operation begins the ehaser holderris gradually caused to tum axially .within its housing by reason of the enseveral chasers at the same time moving toward the outer ends of their respective camuslots. l

The advantages of my invention will be apparent to those skilled in the art. It-will he seen that the strength of the chaser holder is -in no way impaired, since the cam slots are not formed therein, but in lieu are formed in the cover plate. Thus the Chaser holder is a solid body-with the enception of the slots for'med to accommodate the chasers. In. consequence all danger of deflection of the latter is avoided. It will also be seen that the device may be used for-both right and left hand threads, it onlybeing necessary to substitute different leader screws and work holders; and also that by means of the screw l5 the chasers may be adjusted to'accomlnodate piges of different sizes. orto reg' -late the depths of the initial out..

arrested hy'the engagement of pin'9 with the wedge.

gageinent offthe wedge with pin9, the studs 4 oi -thework holder is iuteriorly threaded to receive the screw 14 projecting from the rear el the housing. This employed,L the chasers `themselves being also reinov-n in dotted lines,Fig. 1. To provide for nicety of .ad- Ijustinentfthe pin-9 is preferably equipped with anVV rotatlon o( which the latter is movable at right angles, for

automatically rotating said holder independently ot its ro- 1 0 tation .with the housing as'the work progresses, said studs thereby traveling in said cam slots during the cutting operation to'etfectxthe outward movements ot the chasers..

iu said chamber. chasers mountedin said ring having out- 15 wardly-projectiug studs. a'cover plate rigidly secured to Asaid housingover said ring an'd ihaving a series ot com slots into which said` studs project, and means rotatable with sald'houslng and relative to the piane of rotation' of which the iutt'er is movableat right -angles, for causing` 20 said studs to automatically travel in s'aid slots in the direction in which the housing gresses.l c'

3. A die-housing having a circuler' chamber, a ring dtted in said chamber, chasers mounted in said rlnghaving out; 25 wai-diy .projecting studs, a cower pllite'rigidlysecured tosaid housing over said ringand -having adouble series of cam slots Vin to -whicn said studs project, and means* for causing said studs totravel outwardly in either-*series o! are cutting right or ..lett

-slots, according as the chasers 3()v hand threads.

4. A die-stoclirjcomp`rising a housingfa series of chasers,

n holder therefor mounted in said-housinglandcapabie of'e being rotated with nnd'independen'tiy thereof, a iixed plate 'fhavlng cum slots, studsprojectingvtronisaid chasers into 35 said slots, a pin projecting laterallyfirom' said ehaser is rotated ns the work proi holder. and a wedge rotatable with thehousing'and with which saidpinfis designed to engage, the wedge and the housing having arelative movement at'righbangles to the I'pianeqot rotation. l

5. A vdie `stock comprising a housing, u series of chasers, a holderA therefor ,mounted in-s'ad housing and capable of being rotated with and independently thereof, a fixed plate having a series 'of double cam slots, studs projecting from said chasers into either 'slot ot a palr-there`of, a pinprov jecting laterally from sai-d chaser holder, anda wedge having two tapered side' edges with either of'whlch said pin -is designed to engage, the wedge and the housing havingig relative movement at rightangies to'the plane ot rotation. A r".=-A-di hoi\sing having a circular chamber, a ring fitted tig-.The combination with the housing, the leader screw, and the work holder withwhlch said screw'engages,' ot the radially adjustable chasers, the holder therefor having zr pin projecting outwardly through said housing, awed'ge rotatably mounted on saidwork holder for engaging said pin, said wedge having a spline connection with the houslng,.` and meanstor drawing thechasers outwardly as' tle hoider'thereto'r is rotated independently of the housingby the engagement between said wedge and pin.

7, 'Ihe combination with the housing, the leaderscrew, and' the workhoider with whihs'aid'screwengages, of the radially adjustable chasers, the holder therefor havingaf pin projecting outwardly through said housing,` `a. wedge rotatably mounted onsaid worl; holder tor engaging said pin, saidA wedge huving 'a spline connection with the housing, ailxed platehaving caml slots, and studs projecting trom saidgchasens into lsaid cam slots. I

In:testimonywhereof,A I havesigned this specification in 'the presence` of two subscribing witnesses 

